Congrats Bill! Now you won't get any sleep at all. 😀
George. FLAC is similar to ZIP, just optimized for audio, so you get a little tighter pack. Completely lossless, bit perfect. I converted 1 of your files to FLAC and it was about 1/2 the wave size. ZIP was slightly over 1/2. If you zip each file, then all of them would fit in your dropbox. Do them individually, or maybe 2 or 3 in a group. That keeps the download file size reasonable. No need to put them all in the same zip archive, that would be a BIG file.
In Windows you can normally just right click a file (or multiple files) to send to ZIP. Easy on the Mac, too. No need to worry about loss, both ZIP and FLAC are lossless.
George. FLAC is similar to ZIP, just optimized for audio, so you get a little tighter pack. Completely lossless, bit perfect. I converted 1 of your files to FLAC and it was about 1/2 the wave size. ZIP was slightly over 1/2. If you zip each file, then all of them would fit in your dropbox. Do them individually, or maybe 2 or 3 in a group. That keeps the download file size reasonable. No need to put them all in the same zip archive, that would be a BIG file.
In Windows you can normally just right click a file (or multiple files) to send to ZIP. Easy on the Mac, too. No need to worry about loss, both ZIP and FLAC are lossless.
I was thinking the same.
21 and 24 years ago.
True! It takes courage to raise a child after some age but how much differently would I've behaved as a parent if I knew then what I know now ( what it means to be a parent)
I think Bill is the toughest guy here and the luckiest one !
George
21 and 24 years ago.
True! It takes courage to raise a child after some age but how much differently would I've behaved as a parent if I knew then what I know now ( what it means to be a parent)
I think Bill is the toughest guy here and the luckiest one !
George
Thank you for doing this George: it's priceless and so well done. I've successfully downloaded the first 90 files, they look good and couldn't resist a sneak peak......! looking forward to the next set and details of the test regime in due course.
LD
Congrats bill! Since you have 'other' responsibilities now maybe I will take up the balanced Aurak. I am going to buy a bare board from twisted pear. Then I just carefully sauter the three 1632s? Then match the components from Hans' Latest circuit to the TP board as best I can? Thanks.
Oh I'll still be building it. I just have to confirm 3 things with Hans and mouser order is going in. 🙂
Give Bill a brake.
For the time being he is documenting other changes (pampers per day)
😀 🙂
George
For the time being he is documenting other changes (pampers per day)
😀 🙂
George
currently scanning the Walton book whilst 5of6 spreads his supper on the table. I think I should be able to do a non destructive scan on the xerox at work. Last chapter is most interesting!
I've looked at the 2nd and the 90th play and done some analysis. I've looked only at the 1K tone and the 5K tone. The recordings were surprisingly low in volume, they had to be amplified by 36dB to get good levels. That done, I ran a spectrum in them at 32K points, Blackman-Harris window.
Below are the 5kHz graphs. You'll see that the fundamental of 5kHz is the same from the 2nd play to the 90th, but the 90th does not look as clean. I've also isolated the harmonics for you to look at.
Will do the 1K tone next.
Below are the 5kHz graphs. You'll see that the fundamental of 5kHz is the same from the 2nd play to the 90th, but the 90th does not look as clean. I've also isolated the harmonics for you to look at.
Will do the 1K tone next.
Attachments
There are several very strange artifacts. First of all the almost instantaneous drop off in the noise floor (red) after 5k simply has no reasonable physical explanation. What's with the triple peaks???.
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Yes, but they're spread out in frequency in a non-physical way the thirds are spread out far more than the fourths, I don't see how this could be.
I don't know what's going on there either, except maybe TT instability or ADC clock troubles? But wouldn't that affect all harmonics?
Will run FFT in other software to double check
Will run FFT in other software to double check
I looked at the files in RightMark FFT and see the harmonic Batman ears there, too. They don't appear on play #2, but by play 12 they appear. Also noticed that play #2 seems to be right on speed, but plays 12, 82 & 90 are about 0.7% fast.